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Brief Announcement: Accountability and Reconfiguration — Self-Healing Lattice Agreement

Authors Luciano Freitas de Souza, Petr Kuznetsov, Thibault Rieutord, Sara Tucci-Piergiovanni

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Luciano Freitas de Souza
  • CEA LIST, Université de Paris-Saclay, France
Petr Kuznetsov
  • LTCI, Télécom Paris, Institut Polytechnique de Paris, France
Thibault Rieutord
  • CEA LIST, Université de Paris-Saclay, France
Sara Tucci-Piergiovanni
  • CEA LIST, Université de Paris-Saclay, France

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Luciano Freitas de Souza, Petr Kuznetsov, Thibault Rieutord, and Sara Tucci-Piergiovanni. Brief Announcement: Accountability and Reconfiguration — Self-Healing Lattice Agreement. In 35th International Symposium on Distributed Computing (DISC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 209, pp. 54:1-54:5, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2021)


An accountable distributed system provides means to detect deviations of system components from their expected behavior. It is natural to complement fault detection with a reconfiguration mechanism, so that the system could heal itself, by replacing malfunctioning parts with new ones. In this paper, we describe a framework that can be used to implement a large class of accountable and reconfigurable replicated services. We build atop the fundamental lattice agreement abstraction lying at the core of storage systems and cryptocurrencies. Our asynchronous implementation of accountable lattice agreement ensures that every violation of consistency is followed by an undeniable evidence of misbehavior of a faulty replica. The system can then be seamlessly reconfigured by evicting faulty replicas, adding new ones and merging inconsistent states. We believe that this paper opens a direction towards asynchronous "self-healing" systems that combine accountability and reconfiguration.

Subject Classification

ACM Subject Classification
  • Theory of computation → Distributed algorithms
  • Reconfiguration
  • accountability
  • asynchronous
  • lattice agreement


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